长时间出光条件下反射镜的热变形对光束质量的影响  

Influence of Mirror Thermal Deformation on Beam Quality under Laser Long-Time Irradiation

作　　者：贺敏波[1] 任伟艳[1] 张世强[1] 孙艳宏[1] 张政[1] 

机构地区：[1]西北核技术研究所,陕西西安710024

出　　处：《激光与光电子学进展》2013年第12期182-186,共5页Laser & Optoelectronics Progress

摘　　要：基于有限元Comsol Multiphysics软件,模拟计算了长时间出光条件下反射镜的温度分布和热变形分布。对热变形引起的波像差采用前65阶Zernike模式分解,计算了不同时刻对应的光束质量因子,结果表明:光束质量因子主要来源于离焦像差的贡献,其他像差的影响可以忽略。在此基础上建立了光束质量因子与辐照时间的指数拟合关系,其均方根误差为0.0052。The temperature field and thermal deformation distributions of mirror under laser long-time irradiation are calculated and analyzed by using Comsol Multiphysics software. After presenting the wave aberration of mirror with the first 65 order Zernike polynomials, the beam quality factor β at different time is obtained. The results show that beam quality factor β is mainly composed of defocusing aberration, while other aberrations can be neglected. Then an exponential relationship between beam quality factor and laser irradiation time is offered with the value 0. 0052 of room-mean-square error.

关 键 词：光学器件 反射镜 热变形 Zernike像差 光束质量 

分 类 号：TN248[电子电信—物理电子学]